Module Lcalc.Monomorphize

This function performs type monomorphization in a Catala program with two main actions:

• transforms tuples into named structs.
• creates monomorphized instances of TOption for every occurence of the type.
• creates monomorphized instances of TArray for every occurence of the type; each instance is a struct with a integer length field and a content field whose type still is TArray.

It also returns the new type ordering for the program.